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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$line = "100 95 9 2 42 11 81";
$nums = explode(' ', $line);
usort($nums, function (string $a, string $b) {
var_dump ($a);
var_dump ($b);
$ab = $a . $b;
$ba = $b . $a;
return $ba <=> $ab;
});
var_dump($nums);
// echo implode('', $nums);